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The Urgent Need to Develop Novel Strategies for the Diagnosis and Treatment of Snakebites

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The Urgent Need to Develop Novel Strategies for the Diagnosis and Treatment of Snakebites toxins Review The Urgent Need to Develop Novel Strategies for the Diagnosis and Treatment of Snakebites Harry F. Williams 1 , Harry J. Layfield 1, Thomas Vallance 1, Ketan Patel 2, Andrew B. Bicknell 2, Steven A. Trim 3 and Sakthivel Vaiyapuri 1,* 1 School of Pharmacy, University of Reading, Reading RG6 6AH, UK; [email protected] (H.F.W.); harrylayfi[email protected] (H.J.L.); [email protected] (T.V.) 2 School of Biological Sciences, University of Reading, Reading RG6 6AH, UK; [email protected] (K.P.); [email protected] (A.B.B.) 3 Venomtech Ltd., Discovery Park, Sandwich, Kent CT13 9ND, UK; [email protected] * Correspondence: [email protected] Received: 30 May 2019; Accepted: 18 June 2019; Published: 20 June 2019 Abstract: Snakebite envenoming (SBE) is a priority neglected tropical disease, which kills in excess of 100,000 people per year. Additionally, many millions of survivors also suffer through disabilities and long-term health consequences. The only treatment for SBE, antivenom, has a number of major associated problems, not least, adverse reactions and limited availability. This emphasises the necessity for urgent improvements to the management of this disease. Administration of antivenom is too frequently based on symptomatology, which results in wasting crucial time. The majority of SBE-affected regions rely on broad-spectrum polyvalent antivenoms that have a low content of case-specific efficacious immunoglobulins. Research into small molecular therapeutics such as varespladib/methyl-varespladib (PLA2 inhibitors) and batimastat/marimastat (metalloprotease inhibitors) suggest that such adjunctive treatments could be hugely beneficial to victims. Progress into toxin-specific monoclonal antibodies as well as alternative binding scaffolds such as aptamers hold much promise for future treatment strategies. SBE is not implicit during snakebite, due to venom metering. Thus, the delay between bite and symptom presentation is critical and when symptoms appear it may often already be too late to effectively treat SBE. The development of reliable diagnostical tools could therefore initiate a paradigm shift in the treatment of SBE. While the complete eradication of SBE is an impossibility, mitigation is in the pipeline, with new treatments and diagnostics rapidly emerging. Here we critically review the urgent necessity for the development of diagnostic tools and improved therapeutics to mitigate the deaths and disabilities caused by SBE. Keywords: snakebite envenoming (SBE); venom; diagnostics; therapeutics; toxin neutralisation; neglected tropical disease Key Contribution: This review highlights the key factors contributing to the gross mortality and morbidity associated with snakebite envenoming. The current research taking place to overcome this complex disease and the urgent need to develop improved diagnostics and therapeutics for snakebites are also discussed. 1. Introduction Snakebite envenomation (SBE) is a life threatening and traumatising affliction that is unequivocally associated with the world’s most impoverished people [1]. Mortalities from SBE are concentrated in the rural tropics where snakes are in abundance and the agricultural work force is poorly protected. The limited recognition of the scale of the crisis by health authorities around the globe afforded SBE a Toxins 2019, 11, 363; doi:10.3390/toxins11060363 www.mdpi.com/journal/toxins Toxins 2019, 11, 363 2 of 29 place on the World Health Organisation’s list of neglected tropical diseases in 2009 (NTD). This was followed by a contentious removal before again being reinstated in 2017 and quickly being made a priority NTD [2,3]. The confusion surrounding SBE as an NTD is somewhat justified: SBE is not limited to the tropics and all other NTDs are caused by pathogens entering the body: protozoa, helminths, bacteria and viruses [4]. Thus, the causative agents are easier to identify and study by comparison to the diversity of pathologies associated with SBE. Indeed, Australia classes snakebite as a non-intentional injury rather than a disease, but with an average of two deaths a year, it is unlike the crisis seen in more impoverished countries [5]. The extent of SBE taking place every year is estimated to be between 1.8–2.7 million [6]. The actual deaths from SBE are purported to be between 81,000–137,000 [7] and nearly 50,000 of these deaths are estimated to take place in India alone [8]. There are a further 8000 in Pakistan and 6000 in Bangladesh [9], while in the Americas despite 60,000 snakebites taking place annually, deaths are estimated to only be in the hundreds [10]. While shocking, the deaths frequently hide a potentially greater issue, which is the disability and consequential loss to the economic workforce. Delays in seeking medical assistance are common, and postponements for just a couple of days can lead to gangrene, compartmental syndrome and amputation [11]. Surviving SBE can also have mental health implications, with survivors seeing a three-fold increase in depressive disorders compared to the general population [12]. Post-traumatic stress disorder also occurred in a further 20% of SBE victims surveyed in Sri Lanka [12]. In West Africa, the disability-adjusted life years (years lost due to disability or early death) from SBE are estimated to be over 300,000 [13]. These figures are ever increasing, due to past data suffering from flaws from under-reporting and victims avoiding hospitals for cheaper and more convenient traditional herbalists. This staggering epidemiology is unsurprising when compared to more typical diseases. The marked difference between SBE and many of the other NTDs is the diversity involved in the range of associated toxins seen globally. Cholera, for example, (not limited to the tropics and therefore sometimes ignored as an NTD), like SBE causes many thousands of deaths every year (Table1). Cholera has such a dramatic effect on its victims primarily through one toxin (cholera toxin/CT) released by strains of the Vibrio cholerae bacteria. CT triggers a cascade of events which culminate in an influx of salts and water into the intestine, causing the diarrhoea that aids in transmission of the disease to others, and leaves victims to die by dehydration [14]. The disease is the result of one toxin, from one species of bacteria, with one simple and effective treatment. The nematode infections (shown in Table1) are all a result of roundworms, which have evolved to inhabit the gastrointestinal tract of humans. Despite resulting from a range of species, the same anti-helminthic drugs can easily treat this disorder [15]. In stark contrast, SBE can be the result of bites from hundreds of different snake species, each possessing a multitude of different toxin profiles and leading to a vast array of different pathologies [16]. Treatment is consequently far more complex than the rehydration required to beat the majority of cholera infections [17], and simple prophylactics required to prevent many of the other NTDs (Table1)[ 18]. SBE has proved to be an incredibly complex disease to accurately diagnose and treat appropriately. Toxins 2019, 11, 363 3 of 29 Table 1. A comparison of snakebite envenomation (SBE) alongside other traditional major neglected tropical diseases. Sorted based on deaths. Adapted and updated from Hotez et al. (2007) [19]. Disease (Source Estimated Global Population at Causal Species Clinical Manifestations Treatment Diagnostics of Data) Deaths/An Prevalence Risk Neurotoxicity and paralysis Fang marks, local tissue Snakebite or cardiovascular toxicity and damage, immunoassay Snakes: >90 Genera, Envenomation 81,000–137,000 Up to 2,700,000 6–7 Billion hypovolemic shock. Anti-venom (Aus) Clinical/laboratory >700 Species [7] Cytotoxicity leading to tissue markers give other damage and amputation. indications Oral or Cholera Bacterium: Vibrio 68,400 2,800,000 1.4 Billion Watery diarrhoea intravenous Stool examination [20,21] cholerae rehydration Protist: Leishmania spp. Anti-monials, Cutaneous and Leishmaniasis Transmitted by female amphotericin B, 24,200 12,000,000 350 Million mucocutaneous disease, Biopsy [20] sandflies; Phlebotomus/ pentamidine, kala-azar Lutzomyia spp. miltefosine Chagas’ Disease Protist: Trypanosoma Cardiomyopathy, megacolon, Benznidazole, 8000 5,700,000 70 Million Blood smear [20] cruzi Mega esophagus nifurtimox Hematuria and urogenital Schistosomiasis Trematodes: Schistosoma disease, intestinal and liver (Bilharzia) 4400 207,000,000 779 Million Praziquantel Stool examination spp. fibrosis, growth and [20] cognitive delays Protist: Trypanosoma Pentamidine, Human African brucei amongst other suramin, Trypanosomiasis 3500 300,000 60 Million Sleeping sickness Biopsy or blood smear species. Transmitted by melarsoprol, [20] tsetse flies; Glossina spp. eflornithine Ascariasis Nematode: Ascaris Malnutrition, growth and Albendazole/ 2700 807,000,000 4.2 Billion Stool examination [20] lumbricoides cognitive delays mabendazole Trichuriasis Nematode: Trichuris Deaths rarely Inflammatory bowel disease, Albendazole/ 604,000,000 3.2 Billion Stool examination [22,23] trichiura direct growth and cognitive delays mabendazole Nematodes: Anemia, malnutrition, growth Hookworm Infection Ancylostoma Deaths rarely Albendazole/ 576,000,000 3.2 Billion and cognitive delays, poor Stool examination [22,23] duodenale/Necatora direct mabendazole pregnancy outcome americanus Ivermectin/ Lymphatic Filariasis Nematodes: Wuchereria Deaths rarely Adenolymphangitis, 120,000,000 1.3 Billion diethylcarbamazine
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